90- 



It is moR frequently found on the uiider part of the 

 leaves of aquatic plants. 



The animal is of a light colour, -with a yellowirn call : 

 7t';z/riat/(2 two, fetaceous, long: eyes two, black, placed 

 underneath, at thebafe of the Tentacula. When in motion, 

 it covers great part of the fliell with a thin, pinnated mem- 

 brane, thrown out on the right fide, extending quite behind 

 and partly on the left fide, covering the fmalier volutions : 

 this membrane is verv deeply divided or digitated, the points 

 of which meet, and fometimes interfecl on the back of the 

 fiiell; and are fo tranfparent as fcarce to be difiinguifhed, 

 but by the alliftance of a glafs. The Sujlentaculum, or 

 foot, is long and narrow: the foramen, or common aper- 

 ture, is on the left fide, as mud be the cafe with all the 

 animals of this kind inhabiting hetcrojlrophe fliells. 



It has very confiderable loco-motive power, and tninf- 

 ports itfelf by adhering to the furface of the water, with 

 the (hell downwards : againft which it crawls with as much 

 apparent eafe as on a folid body; and will fometimes let 

 itfidf down gradually by a thread affixed to the furface of 

 the water, in the manner of the Limax jilans^ from the 

 branch of a tree. 



* 



The property of crawling under water, againft its fur- 

 face, is not wholly confined to this fpecies; but we know 

 of no other teftaceous animal capable of fufpending itfelf 

 under water in the fame way. 



* For an account of the Limax films, fee Lin Trans, vol. iv. p. 85. tab. S. 



G g 2 It 



